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I use a GstarEX into a USB Winfast TV thingo as a guidecam. The really good thing is you can dial in sensitivity by setting the frame integration rate. I can always find a guidestar even with a 90mm MAK at 1250mm FL. It has a decent sized sensor and its sensitivity is second to none. With the 150mm achro as a GScope there is never a lack of stars.
With Guidemaster have never had any problems.
Bert
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